Charles myers



(No Model.)

C. & B. MYERS 86 J. DAVIES.

SCREW PROPELLER.

No. 467,824. Patented Jan.

WITNESSES INVENTOIRS Wm Aim/ Mn @fim M Q we NDRR q ravens ASHWGTQN, a. c.

UNITED STATES PATENT OEEIcE.

CHARLES MYERS, ELIZABETH MYERS, AND JOHN DAVIES, OF MANCHESTER, ENGLAND.

SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 467,824, dated January 26, 1892.

Application filed September 3, 1891. Serial No. 4:04.671. (N model.)

To aZZ whom it may concern.- flat bladeinaybe used; but we do not consider Be it known that we, CHARLES MYERS, that either of these will be equal to, and at ELIZABETH MYERS, and JOHN DAVIES, subpresent we prefer, the arrangement Shown in JGGtS of the Queen of Great Britain, residing the drawings.

5 at Manchester, in the county of Lancaster, The blades, as before stated,are preferably England, have invented certain new and usebolted to the hub or center, but may be castful Improvements in Screw-Propellers, of in one piece therewith or otherwise attached which the following is a specification. thereto, and they may, if desired, be pm- This invention relates to improved screwvided with mechanism for turning them upon IO propellers for steamships, and is designed their axes to alterthe pitch,technically known with the object of increasing the efficiency of as feathering. Further,they may be of any the propeller under certain conditions and of desired pitch or dimensions. preventing or obviating the vibration incident \Vhat we claim, and desire to secure by Letthereto where large propellers with few blades tors Patent, is

I 5 are used, and at the same time provide for 1. A screwpropeller for steamships, prothe more general application of looped blades vided with two separate independent looped to screw-propellers. blades and two independent plain flat blades It consists, essentially, of a screw-propeller placed alternately upon the same hub or boss, constructed with one or two separate indesubstantially as described.

20 pendent looped blades (such as shown in the 2. A screw-propeller provided on the same drawings) and one or two separate plain flat hub or boss with two independent looped 7o blades placed alternately round the same hub blades placed opposite to each other in a plane D S- at right angles to the shaft and two separate It will be fully described with reference to plain fiat blades, also opposite each other,

2 5 the annexed drawings, in which, as an examplaced alternatelytherewith, substantially as ple, a four-bladed propeller is shown. described.

gu1e 1s an elevation; Fig. 2, a side ele- Ascrewpropeller provided with one, two, vatlon; Fig. 3, a plan. or more separate independent looped blades In carrying out theinvention the propeller and one, two, or more separate independent 0 is constructed with a central hub or boss A, plain flat blades on the same hub or boss, subof ordinary construction, to which are bolted stantially as described. orotherwise attached two,three, four, or more at. In a screw-propeller, the combination, blades. The two blades B and C are conwith the hub or boss, of a separate independstructed of flat helically-disposed loops, both ent looped blade and of a separate plain fiat 3 5 ends of which terminate in and are attached blade, substantially as described.

to the boss, one in advance of the other, thus 5. In a screw-propeller for stealnships, the forming a severed loop composed of the radial combination, with the hub or boss A, of the arms a and I), connected together by an outer two separate independent flat looped blades segmental piece 0, inclosing an opening D BandC and thetwo separateplain flat blades 40 through the center of the blade, and the E and F, substantially as described.

other two blades E and F are constructed of In testimony whereof we have signed our 0 a plain flat spiral or twisted blade of any shape names to this specification in the presence of attached to the boss at one end. two subscribing witnesses.

It will of course be understood that, if de- CHARLES MYERS. 45 sired, in a two-bladed propeller one looped ELIZABETH MYERS.

blade and one plain flat blade of ordinary JNO. DAVIES. type may be used, and in a three-bladed pro- 'Wit-nesses: peller one looped blade with two plain flat J. OWDEN OBRIEN, blades or two looped blades with one plain WILLIAM H. TAYLOR. 

